通过JavaScript计算季度和年度平均值
假设我们有一个数字数组，如下所示：
const arr = [1,2,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
我们需要编写一个JavaScript函数，该函数接受一个这样的数组并将该数组分成中间的季度和年度组。
上面的数组的组应该看起来像这样-
const quarterly = [[1,2,2],[4,5,6],[7,8,9],[10,11,12],[13,14,15],[16,17,18],[19,20]]; const yearly = [[1,2,2,4,5,6,7,8,9,10,11,12],[13,14,15,16,17,18,19,20]];
然后，该函数应计算特定季度和年份的平均值，然后返回平均值数组。
示例
为此的代码将是-
const arr = [1,2,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
const findAverages = arr => {
const quarterLength = 3, yearLength = 12;
const sumOfGroup = (arr, num) => {
return arr.reduce((acc, val, ind) => {
if (ind % num === 0){
acc.push(0);
};
acc[acc.length - 1] += val;
return acc;
}, []);
};
const quarters = sumOfGroup(arr, quarterLength);
const years = sumOfGroup(arr, yearLength);
return {
"yearlyAverage": years,
"quarterlyAverage": quarters
};
};
console.log(findAverages(arr));输出结果
控制台中的输出-
{
yearlyAverage: [ 77, 132 ],
quarterlyAverage: [
5, 15, 24, 33,
42, 51, 39
]
}